While INPUT ANS,1 will work most of the time, if the user decides to
press the backspace key or even the ESC key, nothing will happen.

An alternative is: 

ANS = KEYIN()
CLEARINPUT

Which will grab a single character (including a backspace, etc). Note:
if the keystroke sends two characters (eg. an escape sequence of an
editing key - like Ins, Del, Page Up, etc) then KEYIN() will only get
the first character. The CLEARINPUT statement clears all additional
characters from the input buffer.

--Adrian






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